Mac/Linux:
From the Terminal type –
cd ~/.sfdx
Then put below command to list all salesforce connection Js file.
ls
Then remove the json file that is not required –
rm omnitest500@gmail.com.json
Windows:
you can press windows key + r then type %USERPROFILE%\.sfdx
In that directory you’ll find a json file for each login saved, each one named after your username in that org. Then delete the json file that is not required.

He is a technology evangelist, Salesforce trainer, blogger, and working as a Salesforce Technical Lead. After working in Java based project implementation, he jumped to the Salesforce system on a whim and never looked back. He fell in love with Salesforce’s flexibility, scalability, and power. He expanded his knowledge of the platform and became a Certified App Builder, Administrator, Platform Developer I, II, SalesCloud Consultant, total 11 x certified while leading the Salesforce implementation and technology needs. He has worked in a wide variety of applications/services like desktop, web and mobile applications.